Chamber-bottom baffle, combustion chamber comprising same and gas turbine engine fitted therewith

1. A baffle for a bottom of a combustion chamber of a gas turbine engine, comprising:

a flat portion of wall with an upstream face, a downstream face and an opening for an injector of the combustion chamber to pass through;

first and second longitudinal edges oriented in a radial direction relative to an axis of the engine; and

first and second transverse edges which are rounded to follow the a curvature of the combustion chamber and curved towards an inside of the combustion chamber,

wherein the first longitudinal edge includes a joint cover arranging a housing and the second longitudinal edge having a fitted tongue,

wherein the first longitudinal edge cooperates with and covers the second longitudinal edge of an adjacent baffle so as to seal the junction between the two edges while allowing the baffles to slide relative to one another when the wall of the chamber bottom expands,

wherein the tongue extends from a free edge of the first transverse edge along the upstream face of the flat portion to a free edge of the second transverse edge,

wherein the tongue presents a groove-shaped housing, and

wherein a plurality of the baffles cover an entire circumference of the combustion chamber.

2. The baffle as claimed in claim 1 , wherein the housings are arranged equally along longitudinal edges of the curved portion of the transverse edges.

3. The baffle as claimed in claim 1 , wherein the second longitudinal edge does not include a joint cover, the first and second longitudinal edges being matched in order to adapt to an edge of another same baffle placed edge-to-edge.

4. The baffle as claimed in claim 1 , further comprising another joint cover along the second longitudinal edge.

5. The baffle comprising two longitudinal edges matching the joint covers of the baffle of claim 4 .

6. The baffle as claimed in claim 1 , wherein the groove-shaped housing cooperates with the second longitudinal edge of the adjacent baffle.

7. The baffle as claimed in claim 1 , wherein the groove-shaped housing cooperates with a fitted tongue.

8. A combustion chamber of a gas turbine engine, being annular comprising an outer wall, an inner wall, a wall connecting the two walls and forming a chamber bottom, baffles as claimed in claim 1 and comprising a portion of wall parallel to the chamber bottom, being fitted in the bottom.

9. The combustion chamber as claimed in claim 8 , comprising baffles including a joint cover along the first longitudinal edge and the second longitudinal edge does not include a joint cover, the first and second longitudinal edges being matched in order to adapt to an edge of another same baffle placed edge-to-edge, all of the baffles being identical.

10. The combustion chamber as claimed in claim 8 , comprising baffles with the housing formed by the groove-shaped housing, all the baffles being identical, a metal tongue being housed in the grooves of the joint covers.

11. The combustion chamber as claimed in claim 8 , comprising a first set of baffles including a joint cover along the first and second longitudinal edges, and a second set of baffles including first and second longitudinal edges matching the joint covers of the first set of baffles, wherein the first set of baffles alternate with the second set of baffles.

12. The combustion chamber as claimed in claim 8 , wherein the chamber bottom comprises a channel arranging an air gap between the chamber bottom and the joint covers.

13. A chamber of the convergent type as claimed in claim 8 .

14. A gas turbine engine comprising a combustion chamber as claimed in claim 8 .